JPH05154409A - Electrical precipitator - Google Patents

Abstract

PURPOSE:To cope with some variation on manufacture, to increase dust collecting efficiency and to get high safety by arranging plural linear electrodes shorter than the distance between a pair of opposite electrodes about perpendicular to the opposite surfaces of a pair of the opposite electrodes at appropriate intervals. CONSTITUTION:A discharge electrode 2 is formed by plural linear electrodes shorter than the distance between a pair of opposite electrodes 1 and the linear electrodes are arranged about perpendicular to the opposite surfaces of a pair of opposite electrodes 1 at appropriate intervals. Thereby even if there is some variation in the distance between the discharge electrode 2 and the opposite electrode 1, the nearer the opposite electrode 1 the discharge electrode 2 is, the more discharge current quantity the discharge electrode 2 has and the tip of the discharge electrode is eroded by a spattering phenomenon to adjust its length so that its discharge current may become the same as that of the other discharge electrode 2. And because of its being plural linear electrodes, the discharge electrode 2 has charge greatly concentrated to cause large ionization tendency inside electrified part. And even if there occur cut, etc., in a part of the discharge electrode 2, because of its being shorter than the opposite electrode 1, short circuit between the electrodes does not happen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic precipitator, and more particularly to improvement of a discharge electrode in a charging section.

[0002]

2. Description of the Related Art An electrostatic precipitator has a main function of causing a corona discharge between a discharge electrode and a counter electrode and charging the dust in the air by the corona discharge, and the charged dust. It has two functions, a dust collecting function for collecting dust. The dust collection characteristic of such an electrostatic precipitator is almost proportional to the discharge current characteristic of the charging section (ionizer). In the charging section, it is important from a design standpoint such as safety that a larger discharge current is allowed to flow at a voltage as low as possible. Therefore, the discharge electrode of the charging unit needs to have a sufficiently small surface area and volume with respect to the counter electrode. For this reason, a thin metal wire pulled by a spring body or the like is used for the discharge electrode.

FIG. 5 shows a charging section in such a conventional electrostatic precipitator. FIG. 2B is a sectional view of the discharge electrode and the counter electrode portion in FIG. The electrostatic precipitator is provided with a charging unit on the upstream side and a dust collecting unit (not shown) on the downstream side with respect to the flow of air to be cleaned. In the figure, 10 is an ionizer frame, and the ionizer frame 10 has a diameter of 100 μm.
The discharge electrodes 11 and the counter electrodes 12 each made of a thin metal wire are alternately arranged at appropriate intervals. One end of the discharge electrode 11 made of a thin metal wire is connected to the electrode terminal 14 via the coil spring 13, and the other end is hooked by the hooking terminal 15 and pulled so as to be parallel to the surface of the counter electrode 12. .. Then, in this example, a high voltage (+) is applied to the discharge electrode 11 to cause corona discharge, and the dust 16 in the air is charged. On the other hand, the dust collecting part (not shown) is composed of a dust collecting electrode and a counter electrode which are arranged to face each other with an appropriate interval. Then, a voltage is applied between the electrodes to collect the dust 16 charged by the charging portion.

[0004]

The conventional electrostatic precipitator has the following problems.
In order to improve the discharge performance and suppress the ozone generation amount as much as possible,
As a discharge electrode, a wire system in which a thin metal wire pulled by a spring body or the like is arranged in parallel with a counter electrode is predominant. However, the wire type electrostatic precipitator has the following problems because the discharge electrode is made of a thin metal wire having an extremely thin wire diameter pulled by a spring body or the like.

In the manufacturing process, when the discharge electrode made of a thin metal wire does not come to the center between the two counter electrodes arranged in parallel, only the one closer to the counter electrode may discharge and the other may not discharge at all. .. This reduces the dust collection efficiency (Fig. 6).
(A), (b), (c)). At the time of maintenance such as manufacturing, transportation, and electrode cleaning, the metal thin wire may be cut, so that careful handling is required. In order to keep the distance between the metal thin wire, which is the discharge electrode, and the counter electrode at a constant distance, it is necessary to constantly apply a constant tension to the metal thin wire. As a result, the thin metal wire may be cut due to long-term use, and if the cutting occurs, there is a risk that an accident may occur due to contact with the counter electrode (see (a) and (b) of FIG. 7). .. At the time of manufacturing, it is necessary to control the tension of the thin metal wires, which causes an increase in manufacturing cost.

[0006] Therefore, an object of the present invention is to provide an electrostatic precipitator which can cope with slight variations during manufacturing, can improve the dust collecting efficiency, and is highly safe.

[0007]

In order to solve the above-mentioned problems, the present invention has a structure in which a discharge electrode is arranged between a pair of counter electrodes which are opposed to each other in parallel, and is generated between the discharge electrode and the counter electrode. An electrostatic precipitator that collects dust in the air by corona discharge to collect the dust, wherein the discharge electrode has a plurality of linear electrodes that are shorter than the interval between the pair of counter electrodes facing each other. The gist is that they are arranged at appropriate intervals in a direction substantially perpendicular to the surface.

[0008]

With the above construction, even if there are some variations in the distance between the plurality of discharge electrodes and the counter electrode during the manufacturing process, the discharge electrode closer to the counter electrode has a larger discharge current amount, and the electrode tip is eroded by the sputtering phenomenon. The length is adjusted so that it becomes the same as the discharge current amount of the other discharge electrodes with the passage of time. This enables stable operation for a long period of time. Since the discharge electrode is composed of a plurality of linear electrodes, the concentration of electric charges is large, and the ionized region inside the charging unit is large. As a result, the dust collection efficiency is improved. Further, even if a part of the discharge electrode is cut during cleaning or discharging, the size of the discharge electrode is shorter than the distance between the opposing electrodes, so that there is no possibility of short-circuiting between the electrodes, and high safety is obtained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.

First, the structure of the electrostatic precipitator will be described with reference to FIG. 1. A charging unit having a discharge electrode and a counter electrode is provided on the upstream side of the flow of air to be cleaned, and is shown on the downstream side. An omitted dust collecting part is provided. Further, in this embodiment, the charging section is configured as follows.

That is, a discharge electrode 2 composed of a plurality of linear electrodes shorter than the distance between the electrodes 1 and 1 is supported by an aggregate 3 between a pair of opposed electrodes 1 and 1 facing each other in parallel. The pair of opposing electrodes 1 and 1 are arranged at appropriate intervals in a substantially vertical direction on the opposing surfaces. In consideration of discharge characteristics and the like, the linear discharge electrode 2 preferably has a wire diameter of 200 μm or less, and is made of tungsten (W), titanium (Ti), nickel (Ni), or the like, and is welded to the aggregate 3. It is fixed by etc.

The electrostatic precipitator of this embodiment is constructed as described above, and when the switch 5 is turned on, a high voltage (+) is applied to the discharge electrode 2 from the power source 4 and the corona between the counter electrode 1 and the counter electrode 1. Electric discharge occurs and dust in the air is charged. At this time, even if the discharge electrode 2 made of a thin metal wire is deformed by washing or the like as shown in FIG.
Between the electric charge of the discharge electrode 2 and the opposite characteristic charge of the counter electrode 1 act on each other, and the tip of the discharge electrode 2 tries to approach the counter electrode 1. Therefore, as shown in FIG. It is possible to keep straight. And the discharge electrode 2
Since is composed of a linear electrode, the concentration of electric charges is large and the region of ionization inside the charging portion is also large. As a result, the dust collection efficiency is improved. Also, as shown in FIGS. 3A and 3B, each discharge electrode 2 is manufactured during the manufacturing process.
Even if the distance between the tip and the counter electrode 1 varies,
The closer to the counter electrode 1, the larger the discharge current amount, and accordingly, the collision of corona ion particles and electrons at the tip of the discharge electrode 2 is increased, and further, the discharge phenomenon is caused by the sputtering phenomenon.
Is eroded and its length is adjusted so as to be the same as the amount of discharge of the other discharge electrodes 2 (FIG. 3C). Therefore, unlike the conventional example, it is not necessary to raise the manufacturing precision very hard, and since the discharge occurs even with a somewhat rough precision, the productivity is improved. In addition, by cleaning,
As shown in FIG. 4 (b), even if the discharge electrode 2 is disengaged from the aggregate 3 or is broken in the middle, the size of the discharge electrode 2 is shorter than the distance between the opposing electrodes 1, and therefore the linear scraps are scattered. There is no risk of short-circuiting between electrodes.

[0013]

As described above, according to the present invention,
The discharge electrode is formed by a plurality of linear electrodes that are shorter than the distance between the pair of opposing electrodes, and the plurality of linear electrodes are arranged on the opposing surfaces of the pair of opposing electrodes at appropriate intervals in a substantially vertical direction. Therefore, even if there is some variation in the distance between the discharge electrode and the counter electrode, the discharge electrode closer to the counter electrode has a larger discharge current amount, and the electrode tip is corroded due to the sputtering phenomenon, and the discharge current amount is the same as that of other discharge electrodes. The length is adjusted so that Therefore, it is possible to cope with a slight variation in manufacturing, and the manufacturability can be improved. Since the discharge electrode is composed of a plurality of linear electrodes, the concentration of charges is large and the ionization region inside the charging section is large, so that the dust collection efficiency is improved. Further, even if a part of the discharge electrode is cut for some reason, the size of the discharge electrode is shorter than the distance between the opposing electrodes, so that a short circuit between the electrodes does not occur and high safety can be obtained.

[Brief description of drawings]

FIG. 1 is a main part configuration diagram showing an embodiment of an electrostatic precipitator according to the present invention.

FIG. 2 is a diagram for explaining the operation of the present embodiment.

FIG. 3 is a diagram for explaining a discharge state in the case where the distance between the discharge electrode and the counter electrode varies in the present embodiment.

FIG. 4 is a diagram for explaining the safety when the discharge electrode is broken in the present embodiment.

FIG. 5 is a configuration diagram of a conventional electric dust collector.

FIG. 6 is a diagram for explaining a discharge state when the discharge electrode is offset to one counter electrode side in the conventional example.

FIG. 7 is a diagram for explaining a case where a discharge electrode is broken in a conventional example.

[Explanation of symbols]

 1 Counter electrode 2 Discharge electrode 3 Aggregate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takao Hattori 8 Shinshinsita-cho, Isogo-ku, Yokohama, Kanagawa Prefecture

Claims (1)

[Claims] 1. Electricity in which a discharge electrode is disposed between a pair of counter electrodes facing each other in parallel, and corona discharge generated between the discharge electrode and the counter electrode charges and collects dust in the air. The dust collector is a dust collector, wherein a plurality of linear electrodes each having a length shorter than an interval between the pair of counter electrodes are arranged at appropriate intervals in a substantially vertical direction on an opposing surface of the pair of counter electrodes. An electrostatic precipitator characterized by becoming.